Posted for "John C. Bohn" <johnb@bohn-tech.com>:

> I would suggest (as others have) the high altitude training in Tulsa and
> installing a CO2 and high altitude alarm in the aircraft....I find after 4
> hours my door seal becomes "weaker" and the motor cold soaks and won't come
> on...losing cabin pressure gradually.  Attached is the instrument the great
> Brad Simmons (731-686-3610) installed it in my 4P- N28487.
>
> CO guardian model 353P (p is panel mount) you can get one and put it
> "behind" the panel too. I have a bright amber light with audible alarm and I
> believe it comes on at 10,000 ft...maybe 12,000.  The CO2 detector is very
> sensitive if you warm up your plane next to a hanger the exhaust makes it
> into the cabin and the alarm will sound.  Good back up.  I know it works
> I've lost pressure on several occasions.
> http://www.guardianavionics.com/files/353-002RevOrig353353Rmanual.pdf
>
>
> John C. Bohn
> email johnb@bohn-tech.com
> Direct (Cell) +1 503.887.2933